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Blockonomics API Documentation
Blockonomics provides Bitcoin and USDT payment processing APIs. This site contains the complete API reference and developer guides.
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- llms.txt
- https://developers.blockonomics.co/llms.txt
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- https://developers.blockonomics.co/llms-full.txt
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Their llms.txt
The beginning of the file, from our validated copy saved 2026-10-26T04:44:26.378Z. Cached copy · Source on blockonomics.co
# Blockonomics API Documentation
> Blockonomics provides Bitcoin and USDT payment processing APIs. This site contains the complete API reference and developer guides.
Base URL: https://www.blockonomics.co/api
## Authentication
All endpoints require a Bearer token in the Authorization header, except GET /op_return and GET /price (public).
Authorization: Bearer YOUR_API_KEY
API keys: https://www.blockonomics.co/merchants#/api
## Key facts
- Payment notifications arrive as HTTP GET callbacks to your callback URL. Include a secret query parameter in that URL and verify it on every callback.
- Callbacks are retried and the same payment arrives several times with an increasing `status`. Make your handler idempotent.
- Test Mode is enabled per store and fires real callbacks without real funds. See the Testing guide.
## Guides
- [Getting Started](https://developers.blockonomics.co/docs/guides/getting-started.md): Create your Blockonomics account, connect a wallet, get your API key, and start accepting crypto payments.
- [Receiving Payments](https://developers.blockonomics.co/docs/guides/receiving-payments.md): Accept BTC and USDT payments on your website using the Blockonomics API — from checkout to confirmed callback.
- [Callbacks](https://developers.blockonomics.co/docs/guides/callbacks.md): Receive real-time payment notifications via HTTP callbacks when a payment status changes.
- [Testing](https://developers.blockonomics.co/docs/guides/testing.md): Simulate BTC and USDT payments without real funds using Blockonomics Test Mode.
- [Sending Bitcoin](https://developers.blockonomics.co/docs/guides/sending-bitcoin.md): Self-hosted wallet service for sending Bitcoin.
- [Web3 USDT Component](https://developers.blockonomics.co/docs/guides/web3-usdt-component.md): Embed a ready-made Web3 component that lets customers pay USDT from Chui Wallet or any browser wallet.
- [WebSocket Payment Notifications](https://developers.blockonomics.co/docs/guides/websocket-payment-notifications.md): Get real-time notifications when payments arrive at your Bitcoin addresses. No polling required.
## API Reference
### Search
- [GET /balance — Get confirmed and unconfirmed balance](https://developers.blockonomics.co/docs/search/getbalance.md): Returns confirmed and unconfirmed balance for one or more Bitcoin addresses or xpubs.
- [GET /searchhistory — Get transaction history for wallet addresses](https://developers.blockonomics.co/docs/search/gettransactionhistory.md): Returns the transaction history for one or more Bitcoin addresses or xpubs, treated as a single wallet.
- [GET /tx_detail — Get transaction details](https://developers.blockonomics.co/docs/search/gettransactiondetails.md): Returns full details for a Bitcoin transaction including inputs, outputs, fee, size, and RBF status.
- [GET /op_return — Search OP_RETURN data](https://developers.blockonomics.co/docs/search/searchopreturn.md): Search Bitcoin transactions by their OP_RETURN payload.
### Wallets
- [GE
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